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Friction and wear in a tribological system are directly dependent on the surface structure and roughness of the friction partners involved. In this article, a clear interaction between surface topologies and their roughness depth was identified for the material pairing polyamide 66 – steel. The typical correlation between roughness and wear, initially decreasing and increasing after a wear minimizing roughness, was found for all surface topologies, albeit at different levels. The effect of the surface topology is negligible at low roughness ( S    z    &lt; 2.0 µm) with adhesive wear processes determining the wear behaviour. At higher roughness depths ( S    z    &gt; 2.0 µm), the ability of the surface topology to form a stable transfer film determines the tribological behaviour by limiting the effect of abrasive wear processes. A stable transfer film is formed with sufficient roughness and undercuts in the direction of motion, which can be characterised by the average roughness depth,  R    z   , in the direction of motion. Based on these empirical results, an explanatory model for the observed behaviour is presented.

Influence of production process-induced surface topologies at varying roughness depths on the tribological properties of polyamide steel contact